<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>猜数字</title>
</head>
<body>
    <p class="guesses"></p>
    <p class="lastResult"></p>
    <p class="lowOrHi"></p>
    <label for="guessField">请猜数：</label>
    <input type="text" id="guessField" class="guessField">
    <input type="submit" value="确定" class="guessSubmit">
</body>
    <script>
        let randomNumber = Math.floor(Math.random()*100)+1;

        const guesses = document.querySelector('.guesses');
        const lastResult = document.querySelector('.lastResult');
        const lowOrHi = document.querySelector('.lowOrHi');

        const guessSubmit = document.querySelector('.guessSubmit');
        const guessField = document.querySelector('.guessField');

        let guessCount = 1;
        let resetButton;

        guessField.focus();

        function checkGuess(){
           let userGuess = Number(guessField.value);
           if(guessCount === 1){
               guesses.textContent = '上次猜的数：';
           }
           guesses.textContent += userGuess + ' ';
           if(userGuess === randomNumber){
               lastResult.textContent='恭喜你！猜对了';
               lastResult.style.backgroundColor = 'green';
               lowOrHi.textContent = '';
               setGameOver();
           } else if(guessCount === 10){
               lastResult.textContent = '!!!GAME OVER!!!';
               setGameOver();
           } else {
               lastResult.textContent = '你猜错了！';
               lastResult.style.backgroundColor = 'red';
               if(userGuess < randomNumber){
                   lowOrHi.textContent = '你猜低了！';
               } else if(userGuess > randomNumber) {
                   lowOrHi.textContent = '你猜高了';
               }
           }
        
           guessCount++;
           guessField.value = '';
           guessField.focus();

        }
        guessSubmit.addEventListener('click',checkGuess);

        function setGameOver(){
            guessField.disabled = true;
            guessSubmit.disabled = true;
            resetButton = document.createElement('button');
            resetButton.textContent = '开始新游戏';
            document.body.appendChild(resetButton);
            resetButton.addEventListener('click',resetGame);
        }

        function resetGame(){
            guessCount = 1;

            const resetParas = document.querySelectorAll('.resultParas p');
            for(let i =0 ; i < resetParas.length ; i++){
                resetParas[i].textContent = '';
            }

            resetButton.parentNode.removeChild(resetButton);

            guessField.disabled = false;
            guessSubmit.disabled = false;
            guessField.value = '';
            guessField.focus();

            lastResult.style.backgroundColor = 'white';

            randomNumber = Math.floor(Math.random()*100)+1;
        }
    </script>
</html>